Does it look jolly like Roger? (5)

I believe the answer is:

skull

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'it look jolly like roger?' is the definition.
The definition suggests a singular noun which matches the answer.

I don't understand the rest of the clue.

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(Other definitions for skull that I've seen before include "Bony part of head" , "Head bone" , "Head structure" , "The head-bone" , "brains here" .)

I've seen this clue in the Evening Standard.

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